﻿(function($) {

    $.fn.suggestionInput = function(url, options) {
        var settings = $.extend({
            url: url,
            hintText: "Type in a search term",
            noResultsText: "No results",
            searchingText: "Searching...",
            searchDelay: 300,
            minChars: 1,
            tokenLimit: null,
            jsonContainer: null,
            method: "GET",
            contentType: "json",
            queryParam: "q",
            onResult: null,
            multiItems: true,
            width: null
        }, options);

        settings.classes = $.extend({
            tokenList: "token-input-list",
            token: "token-input-token",
            tokenDelete: "token-input-delete-token",
            selectedToken: "token-input-selected-token",
            highlightedToken: "token-input-highlighted-token",
            dropdown: "token-input-dropdown",
            dropdownItem: "token-input-dropdown-item",
            dropdownItem2: "token-input-dropdown-item2",
            selectedDropdownItem: "token-input-selected-dropdown-item",
            inputToken: "token-input-input-token"
        }, options.classes);

        return this.each(function() {
            var list = $.SuggestionList(this, settings);
            return
        });
    };



    $.SuggestionList = function(input, settings) {
        //
        // Variables
        //

        // Input box position "enum"
        var POSITION = {
            BEFORE: 0,
            AFTER: 1,
            END: 2
        };

        // Keys "enum"
        var KEY = {
            BACKSPACE: 8,
            TAB: 9,
            RETURN: 13,
            ESC: 27,
            LEFT: 37,
            UP: 38,
            RIGHT: 39,
            DOWN: 40,
            COMMA: 188
        };

        // Save the tokens
        var saved_tokens = [];

        // Keep track of the number of tokens in the list
        var token_count = 0;

        // Basic cache to save on db hits
        var cache = new $.SuggestionList.Cache();

        // Keep track of the timeout
        var timeout;

        // Create a new text input an attach keyup events
        var input_box = $(input)//$("<input type=\"text\">")
        .css({
            outline: "none"
        })
        .focus(function() {
            if (settings.tokenLimit == null || settings.tokenLimit != token_count) {
                //show_dropdown_hint();
            }
        })
        .blur(function() {
            hide_dropdown();
        })
        .keydown(function(event) {
            var previous_token;
            var next_token;

            switch (event.keyCode) {
                case KEY.LEFT:
                case KEY.RIGHT:
                case KEY.UP:
                case KEY.DOWN:
                    var dropdown_item = null;

                    if (event.keyCode == KEY.DOWN || event.keyCode == KEY.RIGHT) {
                        if (selected_dropdown_item) {
                            dropdown_item = $(selected_dropdown_item).next();
                        }
                        else {
                            dropdown_item = get_dropdown_first();
                        }
                        if (!dropdown_item.length) {
                            dropdown_item = get_dropdown_first();
                        }
                    } else {
                        if (selected_dropdown_item) {
                            dropdown_item = $(selected_dropdown_item).prev();
                        }
                        else {
                            dropdown_item = get_dropdown_last();
                        }
                        if (!dropdown_item.length) {
                            dropdown_item = get_dropdown_last();
                        }
                    }

                    if (dropdown_item.length) {
                        select_dropdown_item(dropdown_item);
                    }
                    return false;
                    //}
                    break;

                case KEY.BACKSPACE:
                    setTimeout(function() { do_search(false); }, 5);
                    break;

                case KEY.RETURN:
                    if (selected_dropdown_item) {
                        add_token($(selected_dropdown_item));
                    }
                    hide_dropdown();
                    return false;
                case KEY.COMMA:
                    if (selected_dropdown_item) {
                        add_token($(selected_dropdown_item));
                        return false;
                    }
                    break;

                case KEY.ESC:
                    hide_dropdown();
                    return true;

                default:
                    if (is_printable_character(event.keyCode)) {
                        // set a timeout just long enough to let this function finish.
                        setTimeout(function() { do_search(false); }, 5);
                    }
                    break;
            }
        });

        // Keep a reference to the selected token and dropdown item
        var selected_token = null;
        var selected_dropdown_item = null;
        var dropdown_ul = null;

        // The list to store the dropdown items in
        var dropdown = $("<div>")
        .addClass(settings.classes.dropdown)
        //.insertAfter(token_list)
        .insertAfter(input_box)
        .hide();
        if (settings.width) {
            dropdown.css("width", settings.width);
            //input_box.css("width", settings.width - 15);
        }

        init_list();

        //
        // Functions
        //


        // Pre-populate list if items exist
        function init_list() {
            li_data = settings.prePopulate;
            if (li_data && li_data.length) {
                for (var i in li_data) {
                    var this_token = $("<li><p>" + li_data[i].name + "</p> </li>")
                    .addClass(settings.classes.token)
                    .insertBefore(input_box);
                    //.insertBefore(input_token);

                    $("<span>x</span>")
                    .addClass(settings.classes.tokenDelete)
                    .appendTo(this_token)
                    .click(function() {
                        delete_token($(this).parent());
                        return false;
                    });

                    $.data(this_token.get(0), "tokeninput", { "id": li_data[i].id, "name": li_data[i].name });

                    // Clear input box and make sure it keeps focus
                    input_box
                    //.val("")
                    .focus();

                    // Don't show the help dropdown, they've got the idea
                    hide_dropdown();

                    // Save this token id
                    var id_string = li_data[i].id + ","
                    //hidden_input.val(hidden_input.val() + id_string);
                }
            }
        }

        function is_printable_character(keycode) {
            if ((keycode >= 48 && keycode <= 90) ||      // 0-1a-z
           (keycode >= 96 && keycode <= 111) ||     // numpad 0-9 + - / * .
           (keycode >= 186 && keycode <= 192) ||    // ; = , - . / ^
           (keycode >= 219 && keycode <= 222)       // ( \ ) '
          ) {
                return true;
            } else {
                return false;
            }
        }

        // Get an element of a particular type from an event (click/mouseover etc)
        function get_element_from_event(event, element_type) {
            var target = $(event.target);
            var element = null;

            if (target.is(element_type)) {
                element = target;
            } else if (target.parent(element_type).length) {
                element = target.parent(element_type + ":first");
            }

            return element;
        }

        // Inner function to a token to the list
        function insert_token(id, value) {
            var this_token = $("<li><p>" + value + "</p> </li>")
              .addClass(settings.classes.token)
              .insertBefore(input_box);
            //.insertBefore(input_token);

            // The 'delete token' button
            $("<span>x</span>")
          .addClass(settings.classes.tokenDelete)
          .appendTo(this_token)
          .click(function() {
              delete_token($(this).parent());
              return false;
          });

            $.data(this_token.get(0), "tokeninput", { "id": id, "name": value });

            return this_token;
        }

        // Add a token to the token list based on user input
        function add_token(item) {
            var li_data = $.data(item.get(0), "tokeninput");
            // Clear input box and make sure it keeps focus
            input_box
            //.val("")
                .focus();

            // Don't show the help dropdown, they've got the idea
            hide_dropdown();

            if (settings.multiItems) {
                var this_token = insert_token(li_data.id, li_data.name);

                // Save this token id
                var id_string = li_data.id + ","

                //hidden_input.val(hidden_input.val() + id_string);

                token_count++;

                if (settings.tokenLimit != null && settings.tokenLimit >= token_count) {
                    input_box.hide();
                    hide_dropdown();
                }
            }
            else {
                //hidden_input.val(li_data.name);
                input_box.val(li_data.name);
            }
            //;alert(hidden_input.val());
        }

        // Add a token to the token list based on user input
        $.fn.add_token = function(id, name) {
            //var li_data = $.data(item.get(0), "tokeninput");
            var this_token = insert_token(id, name);

            // Clear input box and make sure it keeps focus
            input_box
            //.val("")
            .focus();

            // Don't show the help dropdown, they've got the idea
            hide_dropdown();

            // Save this token id
            var id_string = id + ","
            //hidden_input.val(hidden_input.val() + id_string);

            token_count++;

            if (settings.tokenLimit != null && settings.tokenLimit >= token_count) {
                input_box.hide();
                hide_dropdown();
            }
            //;alert(hidden_input.val());
        }

        // Select a token in the token list
        function select_token(token) {
            token.addClass(settings.classes.selectedToken);
            selected_token = token.get(0);

            // Hide input box
            //input_box.val("");

            // Hide dropdown if it is visible (eg if we clicked to select token)
            hide_dropdown();
        }

        // Toggle selection of a token in the token list
        function toggle_select_token(token) {
            if (selected_token == token.get(0)) {
                deselect_token(token, POSITION.END);
            } else {
                if (selected_token) {
                    deselect_token($(selected_token), POSITION.END);
                }
                select_token(token);
            }
        }

        // Delete a token from the token list
        function delete_token(token) {
            // Remove the id from the saved list
            var token_data = $.data(token.get(0), "tokeninput");

            // Delete the token
            token.remove();
            selected_token = null;

            // Show the input box and give it focus again
            input_box.focus();

            // Delete this token's id from hidden input
            var str = '';  //hidden_input.val()
            var start = str.indexOf(token_data.id + ",");
            var end = str.indexOf(",", start) + 1;

            if (end >= str.length) {
                //hidden_input.val(str.slice(0, start));
            } else {
                //hidden_input.val(str.slice(0, start) + str.slice(end, str.length));
            }

            token_count--;

            if (settings.tokenLimit != null) {
                input_box
                .show()
                //.val("")
                .focus();
            }
        }

        // Hide and clear the results dropdown
        function hide_dropdown() {
            dropdown.hide().empty();
            selected_dropdown_item = null;
        }

        // Populate the results dropdown with some results
        function populate_dropdown(query, results) {
            if (results.length) {
                dropdown.empty();
                dropdown_ul = $("<ul>")
                .appendTo(dropdown)
                .mouseover(function(event) {
                    select_dropdown_item(get_element_from_event(event, "li"));
                })
                .click(function(event) {
                    add_token(get_element_from_event(event, "li"));
                })
                .mousedown(function(event) {
                    // Stop user selecting text on tokens
                    //return false;
                })
                .hide();

                for (var i in results) {
                    if (results.hasOwnProperty(i)) {
                        var name = results[i].name;
                        var this_li = $("<li>" + highlight_term(results[i].name, query) + "</li>")
                        //var this_li = $("<li>" + name + "</li>")
                                      .appendTo(dropdown_ul);

                        if (i % 2) {
                            this_li.addClass(settings.classes.dropdownItem);
                        } else {
                            this_li.addClass(settings.classes.dropdownItem2);
                        }

                        $.data(this_li.get(0), "tokeninput", { "id": results[i].id, "name": htmlDecode(name) });
                    }
                }

                dropdown.show();
                dropdown_ul.slideDown("fast");

            } else {
                hide_dropdown();
            }
        }

        // Highlight the query part of the search term
        function highlight_term(value, term) {
            return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "$1");
        }

        // Highlight an item in the results dropdown
        function select_dropdown_item(item) {
            if (item) {
                if (selected_dropdown_item) {
                    deselect_dropdown_item($(selected_dropdown_item));
                }

                item.addClass(settings.classes.selectedDropdownItem);
                selected_dropdown_item = item.get(0);
            }
        }
        function get_dropdown_first() {
            var item = $(dropdown_ul.children()[0]);
            return item;
        }
        function get_dropdown_last() {
            var item = $(dropdown_ul.children()[dropdown_ul.children().length - 1]);
            return item;
        }
        function select_dropdown_index(index) {
            var item = $(dropdown_ul.children()[index]);
            select_dropdown_item(item);
            return item;
        }


        // Remove highlighting from an item in the results dropdown
        function deselect_dropdown_item(item) {
            item.removeClass(settings.classes.selectedDropdownItem);
            selected_dropdown_item = null;
        }

        // Do a search and show the "searching" dropdown if the input is longer
        // than settings.minChars
        function do_search(immediate) {
            var query = input_box.val().toLowerCase();
            if (query && query.length) {
                if (selected_token) {
                    deselect_token($(selected_token), POSITION.AFTER);
                }
                if (query.length >= settings.minChars) {
                    if (immediate) {
                        run_search(query);
                    } else {
                        clearTimeout(timeout);
                        timeout = setTimeout(function() { run_search(query); }, settings.searchDelay);
                    }
                } else {
                    hide_dropdown();
                }
            }
            else {
                hide_dropdown();
            }
        }

        // Do the actual search
        function run_search(query) {
            var cached_results = cache.get(query);
            if (cached_results) {
                populate_dropdown(query, cached_results);
            } else {
                var queryStringDelimiter = settings.url.indexOf("?") < 0 ? "?" : "&";
                var callback = function(results) {
                    if ($.isFunction(settings.onResult)) {
                        results = settings.onResult.call(this, results);
                    }
                    cache.add(query, settings.jsonContainer ? results[settings.jsonContainer] : results);
                    populate_dropdown(query, settings.jsonContainer ? results[settings.jsonContainer] : results);
                };

                if (settings.method == "POST") {
                    $.post(settings.url + queryStringDelimiter + settings.queryParam + "=" + query, {}, callback, settings.contentType);
                } else {
                    $.get(settings.url + queryStringDelimiter + settings.queryParam + "=" + query, {}, callback, settings.contentType);
                }
            }
        }
    };

    // Really basic cache for the results
    $.SuggestionList.Cache = function(options) {
        var settings = $.extend({
            max_size: 50
        }, options);

        var data = {};
        var size = 0;

        var flush = function() {
            data = {};
            size = 0;
        };

        this.add = function(query, results) {
            //            if (size > settings.max_size) {
            //                flush();
            //            }

            //            if (!data[query]) {
            //                size++;
            //            }

            //            data[query] = results;
        };

        this.get = function(query) {
            return data[query];
        };
    };

})(jQuery);